GR24 alleviates the adverse effects of drought stress on physiology and photosystem II function in alfalfa (<scp><i>Medicago Sativa</i></scp> L.)

Yang, Yuwei; Gu, Mingzhou; Lu, Junfeng; Li, Xiaotong; Liu, Dalin; Li, Xine; Wang, Lin

doi:10.1111/grs.12392

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Chlorophyll serves as the fundamental basis for photosynthesis, and alterations in chlorophyll content play a pivotal role in evaluating plant growth and drought tolerance. Previous studies have demonstrated that SLs enhance chlorophyll content under drought stress in various crops, including wheat [21], maize [31], rapeseed [32], grape [33], and alfalfa [34]. In this study, we observed a decrease in chlorophyll content (chlorophyll a, chlorophyll b, total chlorophyll, and SPAD value) under drought conditions; however, priming with SLs significantly increased these indices under drought stress (Figure S4).…”

Section: Sls Restrained Degradation Of Chlorophylls and Increased Bio...supporting

confidence: 40%

“…The improvement of leaf water relations could increase Pn in wheat under drought stress [37]. Interestingly, application of SLs has been demonstrated to enhance photosynthetic performance under drought conditions [19,32,34,38,39]. In this study, SLs priming could increase antioxidant activity to scavenge excess ROS, improve leaf water relations, and enhance chlorophyll content under drought stress; these changes led to the improvement of photosynthetic performance (Pn, Tr, and Gs), and then increased root and shoot biomass (Figures 1-3, S3 and S4).…”

Section: Sls Promoted Photosynthesis By Increasing Electron Transport...mentioning

confidence: 99%

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Physiological and RNA-Seq Analyses on Exogenous Strigolactones Alleviating Drought by Improving Antioxidation and Photosynthesis in Wheat (Triticum aestivum L.)

Song,

Hu,

Zhou

et al. 2023

Antioxidants

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Drought poses a significant challenge to global wheat production, and the application of exogenous phytohormones offers a convenient approach to enhancing drought tolerance of wheat. However, little is known about the molecular mechanism by which strigolactones (SLs), newly discovered phytohormones, alleviate drought stress in wheat. Therefore, this study is aimed at elucidating the physiological and molecular mechanisms operating in wheat and gaining insights into the specific role of SLs in ameliorating responses to the stress. The results showed that SLs application upregulated the expression of genes associated with the antioxidant defense system (Fe/Mn-SOD, PER1, PER22, SPC4, CAT2, APX1, APX7, GSTU6, GST4, GOR, GRXC1, and GRXC15), chlorophyll biogenesis (CHLH, and CPX), light-harvesting chlorophyll A-B binding proteins (WHAB1.6, and LHC Ib-21), electron transfer (PNSL2), E3 ubiquitin-protein ligase (BB, CHIP, and RHY1A), heat stress transcription factor (HSFA1, HSFA4D, and HSFC2B), heat shock proteins (HSP23.2, HSP16.9A, HSP17.9A, HSP21, HSP70, HSP70-16, HSP70-17, HSP70-8, HSP90-5, and HSP90-6), DnaJ family members (ATJ1, ATJ3, and DJA6), as well as other chaperones (BAG1, CIP73, CIPB1, and CPN60I). but the expression level of genes involved in chlorophyll degradation (SGR, NOL, PPH, PAO, TIC55, and PTC52) as well as photorespiration (AGT2) was found to be downregulated by SLs priming. As a result, the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were enhanced, and chlorophyll content and photosynthetic rate were increased, which indicated the alleviation of drought stress in wheat. These findings demonstrated that SLs alleviate drought stress by promoting photosynthesis through enhancing chlorophyll levels, and by facilitating ROS scavenging through modulation of the antioxidant system. The study advances understandings of the molecular mechanism underlying SLs-mediated drought alleviation and provides valuable insights for implementing sustainable farming practice under water restriction.

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Section: Sls Restrained Degradation Of Chlorophylls and Increased Bio...supporting

confidence: 40%

Section: Sls Promoted Photosynthesis By Increasing Electron Transport...mentioning

confidence: 99%

Physiological and RNA-Seq Analyses on Exogenous Strigolactones Alleviating Drought by Improving Antioxidation and Photosynthesis in Wheat (Triticum aestivum L.)

Song,

Hu,

Zhou

et al. 2023

Antioxidants

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Foliar application of strigolactones improves the desiccation tolerance, grain yield and water use efficiency in dryland wheat through modulation of non-hydraulic root signals and antioxidant defense

Guo,

Wei,

et al. 2023

Stress Biology

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Non-hydraulic root signals (nHRS) are affirmed as a unique positive response to soil drying, and play a crucial role in regulating water use efficiency and yield formation in dryland wheat production. Strigolactones (SLs) can enhance plant drought adaptability. However, the question of whether strigolactones enhance grain yield and water use efficiency by regulating nHRS and antioxidant defense systems in dryland wheat remains unanswered. In this study, pot experiments were conducted to investigate the effects of strigolactones on nHRS, antioxidant defense system, and grain yield and water use efficiency in dryland wheat. The results showed that external application of SLs increased drought-induced abscisic acid (ABA) accumulation and activated an earlier trigger of nHRS at 73.4% field capacity (FC), compared to 68.5% FC in the control group (CK). This phenomenon was mechanically associated with the physiological mediation of SLs. The application of SLs significantly enhanced the activities of leaf antioxidant enzymes, reduced ROS production, and mitigated oxidative damage to lipid membrane. Additionally, root biomass, root length density, and root to shoot ratio were increased under strigolactone treatment. Furthermore, exogenous application of SLs significantly increased grain yield by 34.9% under moderate drought stress. Water use efficiency was also increased by 21.5% and 33.3% under moderate and severe drought conditions respectively, compared to the control group (CK). The results suggested that the application of strigolactones triggered earlier drought-sensing mechanism and improved the antioxidant defense ability, thus enhancing grain yield and water use efficiency in dryland wheat production.

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Strigolactones: A promising tool for nutrient acquisition through arbuscular mycorrhizal fungi symbiosis and abiotic stress tolerance

Naseer,

Zhang,

Mukhtar

et al. 2024

Plant Physiology and Biochemistry

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GR24 alleviates the adverse effects of drought stress on physiology and photosystem II function in alfalfa (Medicago Sativa L.)

Cited by 5 publications

References 29 publications

Physiological and RNA-Seq Analyses on Exogenous Strigolactones Alleviating Drought by Improving Antioxidation and Photosynthesis in Wheat (Triticum aestivum L.)

Physiological and RNA-Seq Analyses on Exogenous Strigolactones Alleviating Drought by Improving Antioxidation and Photosynthesis in Wheat (Triticum aestivum L.)

Foliar application of strigolactones improves the desiccation tolerance, grain yield and water use efficiency in dryland wheat through modulation of non-hydraulic root signals and antioxidant defense

Strigolactones: A promising tool for nutrient acquisition through arbuscular mycorrhizal fungi symbiosis and abiotic stress tolerance

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